Nice frog - think I've seen these before. While I can't help with the designer name, I have spotted the familiar Pukeberg label (white 'gob' of glass on black background) in an article dated 1963. Not sure how useful this is. :?

David that is very useful; the frog has this label and Lindberg died in 1982.Della the other label is ripped in two; I only have the first half which is printed "design: Stig" - and then there is a bit missing.